@article{MR_1981_21_a26,
     author = {\ensuremath{\Pi}.\ensuremath{\Lambda}.  \ensuremath{\Theta}\ensuremath{\varepsilon}o\ensuremath{\delta}\ensuremath{\omega}\ensuremath{\rho}\'{o}\ensuremath{\pi}o\ensuremath{\upsilon}\ensuremath{\lambda}o\ensuremath{\varsigma}},
     title = {H \ensuremath{\varepsilon}\ensuremath{\nu}o\ensuremath{\rho}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} \ensuremath{\pi}\ensuremath{\rho}o\ensuremath{\sigma}\ensuremath{\acute\epsilon}\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\iota}\ensuremath{\sigma}\ensuremath{\eta} \ensuremath{\sigma}\ensuremath{\alpha}\ensuremath{\nu} \ensuremath{\mu}\ensuremath{\acute\epsilon}\ensuremath{\theta}o\ensuremath{\delta}o\ensuremath{\varsigma} \ensuremath{\sigma}\ensuremath{\tau}\ensuremath{\eta} \ensuremath{\delta}\ensuremath{\iota}\ensuremath{\delta}\ensuremath{\alpha}\ensuremath{\sigma}\ensuremath{\kappa}\ensuremath{\alpha}\ensuremath{\lambda}\ensuremath{\acute\iota}\ensuremath{\alpha} \ensuremath{\tau}\ensuremath{\omega}\ensuremath{\nu} {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\omega}\ensuremath{\nu}.}},
     journal = {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} E\ensuremath{\pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\acute\omega}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}},
     pages = {48--56},
     year = {1981},
     volume = {21},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1981_21_a26/}
}